Banca de DEFESA: JOÃO GUSTAVO DA SILVA SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOÃO GUSTAVO DA SILVA SANTOS
DATE: 29/04/2022
TIME: 09:00
LOCAL: Plataforma Google Meet
TITLE:

Analysis of themechanisms of magnetic relaxation in bilayers through the magnetoimpedance effect

KEY WORDS:

Magnetoimpedance - Thin film - Relaxation mechanisms - Spin pumping

PAGES: 132
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

The manipulation and transport of electronic spin angular momentum has been used in the development of high
performance devices. In this context, the magnetic thin film emerges as a promising candidate for the fabrication of sensor
elements, as it presents a stability of magnetic properties, even in increasingly reduced dimensions. Therefore, knowing well the
phenomena involved in the dynamics of magnetization of this type of material is an important step for the development of
technology and science. Thus, our work was divided into two converging lines of investigation, where the essence of research in
these two branches has in common a global objective; to study the mechanisms of magnetic relaxation in samples structured in
bilayers using the magnetoimpedance technique. We focused on finding the effective damping parameter of the samples and
understandinghoweachtypeofmagneticrelaxationmechanismcontributedtotheinvestigatedsystemviathe
magnetoimpedance effect. However, this research presented a great challenge, as it brings innovations in the way of investigating
the dynamics of magnetization in an insulating material through the magnetoimpedance effect. This technique ensures the broad
characterization of magnetization dynamics in ferrimagnetic insulating material, making it possible to analyze the behavior of
magnetization with respect to frequency sweep and external magnetic field simultaneously. With the success of this research, we
consolidated the implementation of a technique that investigates the dynamics ofmagnetization in ferromagnetic insulating
materials

BANKING MEMBERS:
Externo à Instituição - JOSÉ FILIPE VILELA VAZ - UMinho
Externo à Instituição - ANTONIO AZEVEDO DA COSTA - UFPE
Interno - 1060742 - EDIMILSON FÉLIX DA SILVA
Interno - 2411793 - LEONARDO DANTAS MACHADO
Presidente - 1474380 - MARCIO ASSOLIN CORREA
Interno - 1788659 - MATHEUS GAMINO GOMES